Air Horn Questions - 986 Forum - The Community for Porsche Boxster & Cayman Owners

rick3000 · 07-19-2009, 10:29 PM

I haven't bought it yet. None of the Wolo horns seem to go past 119db, the Stebel's seem to do 139bd. Since I normally do not have to honk too often I think I may go with the cheap eBay one. I think I will be able to wire it myself so we'll see.

Kirk · 07-20-2009, 08:11 AM

I've got an air horn on my Box and always ran them on my motorcycles. Yes, I definitely think it's a good thing to have. Mine are actually two horns attached by tubing to a small compressor. I definitely need to use a relay for the power that these draw. There are two electric/stock horns under the front bumper. I pulled the wiring from one of them and used it to trigger the relay. The power to the horns from the relay is fused and goes directly to the battery. I left the other stock horn in place and I recommend you do this too. Air horns take a few milliseconds to respond. It's nice to have the immediate response of an electric horn still in place for when you just want to tap the horn (beep beep) or when you need a real quick response (emergency situation).

Kirk

rick3000 · 07-20-2009, 08:32 AM

I think I understand all the wiring, but where did you connect your air horns to a power source. Did you run a wire to the 12V phone connector, or tap directly into the battery leads?

Kirk · 07-21-2009, 08:10 AM

Quote:

Originally Posted by rick3000

I think I understand all the wiring, but where did you connect your air horns to a power source. Did you run a wire to the 12V phone connector, or tap directly into the battery leads?

I ran a 16 gauge wire directly from the battery (with an in-line fuse) to the relay. The relay is triggered by the horn switch in the steering wheel by using the connections that normally go to one of the OEM electric horns. The relay then allows the air horn to get this power directly from the battery, but only when switched by the horn button.

Kirk

rick3000 · 07-21-2009, 08:16 AM

Thanks, I completely under stand how to wire this in now.
I am going to be running a wire from the 12V phone connector to the front bumper for some custom running lights.
Do you think I could use this power source or would it draw to much power? If it does draw too much power how would I go about tapping directly into the battery?
Thanks!

rick3000 · 07-22-2009, 06:29 AM

"I am going to be running a wire from the 12V phone connector to the front bumper for some custom running lights.
Do you think I could use this power source or would it draw to much power? If it does draw too much power how would I go about tapping directly into the battery?"

Does anyone know how I would tap into the battery or if I would need to?
Thanks again!

Lil bastard · 07-22-2009, 06:58 AM

Quote:

Originally Posted by rick3000

"I am going to be running a wire from the 12V phone connector to the front bumper for some custom running lights.
Do you think I could use this power source or would it draw to much power? If it does draw too much power how would I go about tapping directly into the battery?"

Does anyone know how I would tap into the battery or if I would need to?
Thanks again!

I would suggest running the horn direct from the battery. It's fairly simple. You want to wire the battery to the input terminal of the relay (#30/51), the air horns to the output terminal of the relay (#87). Then use your OEM wiring to trigger the relay by wiring it to the trigger terminal (#86). Terminal #85 is a common ground.

Use a med. gauge wire (16 Ga would be good) with an 'O' ring crimped on one end, add an inline 15 Amp fuse to the wire and a female spade connector on the other. Slip 'O' ring through the bolt on the pos (+) battery cable terminal and attach the spade connector to terminal #30/51.

Here is a page that will help. It specifically wires in an aftermarket air horn (though for another vehicle) : Air Horn Relay